CVE-2025-25249 — Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

Impacted if

• Fortinet FortiSwitchManager ≤ 7.2.5
• Fortinet FortiOS ≤ 7.6.2 · ≤ 7.4.7 · ≤ 7.2.11

Memory corruption · over the network · no login

A heap-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiOS 6.4 all versions, F

CISA Known Exploited Vulnerabilities

Added on 2026-09-09, federal remediation due 2026-09-12. Fortinet FortiOS, FortiSwitchManager, and FortiSASE contain a heap-based buffer overflow vulnerability that allows an attacker to execute unauthorized code or commands via specially crafted packets.

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

First seen by AX-NEWS 10 Sep 2026, 06:33 UTC · latest story 13 Oct 2026, 00:00 UTC. Severity: NVD, or the CVE record while the NVD has not scored it. This product uses data from the NVD API but is not endorsed or certified by the NVD.